X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4960680 for flyrotary@lancaironline.net; Thu, 28 Apr 2011 12:18:10 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=p8T7S1jbXQ+OONe24eSl2CJrmCQK/v/iAc3/AqmF+T8= c=1 sm=0 a=RKxS59jiEN8A:10 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=ayC55rCoAAAA:8 a=arxwEM4EAAAA:8 a=r1ClD_H3AAAA:8 a=7g1VtSJxAAAA:8 a=Ia-xEzejAAAA:8 a=KXbv3H6SW-EhcAx63UUA:9 a=klpTFWVKCaeer9z8uC4A:7 a=wPNLvfGTeEIA:10 a=Qa1je4BO31QA:10 a=pGLkceISAAAA:8 a=K-n4Xg4QNfqM7CgI7S4A:9 a=FNXF7-XV3nbpURP1EzwA:7 a=MSl-tDqOz04A:10 a=EzXvWhQp4_cA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:62558] helo=EdPC) by cdptpa-oedge04.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id B9/CD-04441-F1399BD4; Thu, 28 Apr 2011 16:17:35 +0000 Message-ID: From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Cooling Inlets Date: Thu, 28 Apr 2011 12:16:59 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01CC059E.2C95D3D0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_0015_01CC059E.2C95D3D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Looks Great, so now you can put out a drag chute to keep you below Vne = and run full throttle. That 3 rotor does have a nice sound - noticed = when you took of a Sun & Fun - it just sounded "authoritative" not = whinny like the two rotor can. Sure was sweet. Ed From: Tracy=20 Sent: Thursday, April 28, 2011 11:59 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Cooling Inlets So your enhanced pressure recovery with the new inlets is likely largely = due to the better control of the entering airflow and the reduction of = any separation caused by the sharp ages of the tubes. =20 Also looks great. I noticed the inlets appears to have a removable cover = -- I presume this is so you can remove the inlet cover in order to = remove the cowl (or for further experimentation {:>)?) Ed Thanks Ed, I agree, that looks like the main factor. =20 The inlets were made in 3 steps/pieces, each one bonded to the others as = I went so its all one piece that slips tightly over the OD of the inlet = pipe, sweeps back to fair into the cowl contours and then secured with a = couple of screws into nut-plates in the cowl. Mostly made from carbon = fiber to keep it light. The inlet lip was the interesting part to make. I made a tool of = aluminum sheet the same shape as a cutaway drawing of the lip, mounted = that in the lathe toolpost, chucked up a 9" square x 2" thick piece of = urethane foam using a piece of all-thread & plywood washers. Set the = 'tool' for the proper ID of the inlet pipe and then machined the inlet = shape into the foam to form a female mold. Painted the foam mold with = melted paraffin for a smooth finish and mold release then laid up the = carbon fiber in the mold. Looked like a part out of a machine when = taken out and trimmed. Only snag is that removing paraffin residue = from finished part is critical. There are several fish-eye areas in the = paint that will need to be sanded out & repainted. Tracy On Thu, Apr 28, 2011 at 9:51 AM, Ed Anderson = wrote: Great to hear, Tracy. All of the studies I have read indicates anything you can do to = prevent flow separation near the inlet (which you undoubtedly had at = anything off straight and level with those tubes) greatly aids cooling. = The studies say that anytime you have a disturbed/(turbulent) area of = air impinging on an area of your radiator face you do not get good = pressure recovery from disturbed air - this in turn can cause that area = impacted to suffer a 20% degradation of cooling effectiveness and also = increased drag. The further upstream from the core the disturbance = occurs the larger the affected area of the core. So your enhanced pressure recovery with the new inlets is likely = largely due to the better control of the entering airflow and the = reduction of any separation caused by the sharp ages of the tubes. =20 Also looks great. I noticed the inlets appears to have a removable = cover -- I presume this is so you can remove the inlet cover in order to = remove the cowl (or for further experimentation {:>)?) Ed Edward L. Anderson Anderson Electronic Enterprises LLC 305 Reefton Road Weddington, NC 28104 http://www.andersonee.com http://www.eicommander.com From: Tracy=20 Sent: Thursday, April 28, 2011 9:07 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Cooling Inlets Finally got around to finishing my cooling inlets. (pictures attached) = Up until now they were simply round pipes sticking out of the cowl. = The pipes are still there but they have properly shaped bellmouths on = them. The shape and contours were derived from a NASA contractor = report (NASA_CR3485) that you can find via Google. Lots of math & = formulas in it but I just copied the best performing inlet picture of = the contour. Apparently there is an optimum radius for the inner and = outer lip of the inlet. There was no change to the inlet diameters of = 5.25" on water cooler and 4.75" on oil cooler. The simple pipes performed adequately in level flight at moderate = cruise settings even on hot days but oil temps would quickly hit redline = at high power level flight and in climb. =20 The significant change with the new inlet shape is that they appear to = capture off-axis air flow (like in climb and swirling flow induced by = prop at high power) MUCH better than the simple pipes. First flight = test was on a 94 deg. F day and I could not get the oil temp above 200 = degrees in a max power climb. They may have gone higher if the air = temperature remained constant but at 3500 fpm the rapidly decreasing OAT = kept the temps well under redline (210 deg F). I have an air pressure instrument reading the pressure in front of the = oil cooler and was amazed at the pressure recovered from the prop wash. = At 130 MPH the pressure would almost double when the throttle was = advanced to WOT. That did not happen nearly as much with the simple = pipes. =20 These inlets ROCK! Tracy Crook -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html ------=_NextPart_000_0015_01CC059E.2C95D3D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Looks Great, so now you can put out a drag chute = to keep=20 you below Vne and run full throttle.  That 3 rotor does have a nice = sound -=20 noticed when you took of a Sun & Fun - it just sounded = "authoritative" not=20 whinny like the two rotor can.  Sure was sweet.
 
Ed
From: Tracy
Sent: Thursday, April 28, 2011 11:59 AM
Subject: [FlyRotary] Re: Cooling Inlets

So your enhanced pressure recovery with the new = inlets is=20 likely largely due to the better control of the entering airflow and the = reduction of any separation caused by the sharp ages of the tubes.  =
 
Also looks great. I noticed the inlets appears = to have a=20 removable cover -- I presume this is so you can remove the inlet=20 cover in order to remove the cowl (or for further experimentation=20 {:>)?)
 
Ed

Thanks Ed,
I agree, that looks like = the main=20 factor.
  
The inlets were made in 3 steps/pieces, each = one=20 bonded to the others as I went so its all one piece that slips tightly = over the=20 OD of the inlet pipe, sweeps back to fair into the cowl contours and = then=20 secured with a couple of screws into nut-plates in the cowl.   = Mostly=20 made from carbon fiber to keep it light.

The inlet lip was the=20 interesting part to make.  I made a tool of aluminum sheet the same = shape=20 as a cutaway drawing of the lip, mounted that in the lathe toolpost, = chucked up=20 a 9" square x 2" thick piece of urethane foam using a piece of = all-thread &=20 plywood washers.  Set the 'tool' for the proper ID of the inlet = pipe and=20 then machined the inlet shape into the foam to form a female mold.  = Painted=20 the foam mold with melted paraffin for a smooth finish and mold release = then=20 laid up the carbon fiber in the mold.   Looked like a part out = of a=20 machine when  taken out and trimmed.   Only snag is that = removing=20 paraffin residue from finished part is critical.  There are several = fish-eye areas in the paint that will need to be sanded out &=20 repainted.

Tracy


On Thu, Apr 28, 2011 at 9:51 AM, Ed Anderson = <eanderson@carolina.rr.com&g= t;=20 wrote:
Great to hear, Tracy.
 
All of the studies I have read =  indicates=20 anything you can do to prevent flow separation near the inlet (which = you=20 undoubtedly had at anything off straight and level with those tubes) = greatly=20 aids cooling. 
 
The studies say that anytime you have a=20 disturbed/(turbulent) area of air impinging on an area of your = radiator face=20 you do not get good pressure recovery from disturbed air - this = in turn=20 can cause that area impacted  to  suffer a 20% = degradation of=20 cooling effectiveness and also increased drag.  The further=20 upstream from the core the disturbance occurs the larger the = affected=20 area of the core.
 
So your enhanced pressure recovery with the = new inlets=20 is likely largely due to the better control of the entering airflow = and the=20 reduction of any separation caused by the sharp ages of the = tubes. =20
 
Also looks great. I noticed the inlets appears = to have a=20 removable cover -- I presume this is so you can remove the inlet=20 cover in order to remove the cowl (or for further experimentation = {:>)?)
 
Ed
 
Edward L. Anderson
Anderson Electronic = Enterprises=20 LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com
 
 

From: Tracy
Sent: Thursday, April 28, 2011 9:07 AM
Subject: [FlyRotary] Re: Cooling = Inlets

Finally got=20 around to finishing my cooling inlets. (pictures attached)  Up = until now=20 they were simply round pipes sticking out of the cowl.   The = pipes=20 are still there but they have properly shaped bellmouths on = them.  =20 The shape and contours were derived from a NASA contractor report=20 (NASA_CR3485) that you can find via Google.  Lots of math & = formulas=20 in it but I just copied the best performing inlet picture of the=20 contour.   Apparently there is an optimum radius for the = inner and=20 outer lip of the inlet.   There was no change to the inlet = diameters=20 of 5.25" on water cooler and 4.75" on oil cooler.

The simple = pipes=20 performed adequately in level flight at moderate cruise settings even = on hot=20 days but oil temps would quickly hit redline at high power level = flight and in=20 climb. 

The significant change with the new inlet shape = is that=20 they appear to capture off-axis air flow  (like in climb and = swirling=20 flow  induced by prop at high power)  MUCH better than the = simple=20 pipes.    First flight test was on a 94 deg. F day and I = could not=20 get the oil temp above 200 degrees in a max power climb.    = They may=20 have gone higher if the air temperature remained constant but at 3500 = fpm the=20 rapidly decreasing OAT kept the temps well under redline (210 deg = F).

I=20 have an air pressure instrument reading the pressure in front of the = oil=20 cooler and was amazed at the pressure recovered from the prop = wash.  At=20 130 MPH the pressure would almost double when the throttle was = advanced to=20 WOT.   That did not happen nearly as much with the simple=20 pipes.  

These inlets ROCK!

Tracy=20 Crook

--
Homepage:  http://www.flyrotary.com/
Archive and = UnSub:  =20 http://mail.lancaironline.net:81/lists/flyrotary/List.htm= l


------=_NextPart_000_0015_01CC059E.2C95D3D0--